No affect on amount of physical memory resources used for virtualization overhead

[dirtdevil01]

"Which of the following has no effect on the amount of physical memory resources used for virtualization overhead (Choose Two)?"

I keep getting this question wrong on the practice exam and third party practice exams and I don't understand why. Here is the explination from the offical practice exam...

Incorrect response(s):

Installing a 64-bit versus 32-bit operating system.

Increasing the number of virtual CPUs in the virtual machine.

Explanation: Increasing the number of virtual CPUs in the virtual machine will increase the overhead for the virtual machine. Adjusting memory share values affects priority access to resources when contention exists, but does not increase or decrease a virtual machine's overhead. Operating System architecture affected memory overhead in earlier generations of ESX, but does not impact overhead in vSphere 4.x

What is the right answer and why? I looked through the PDFs but I couldn't find specificly where it explains this and why.

[AndreTheGiant]

For overhead see http://www.vmware.com/pdf/vsphere4/r41/vsp_41_resource_mgmt.pdf

The question is which does NOT increase overhead.

More vCPU or a 64 bit architecture require MORE overhead.

Andre

[chriswahl]

The affect of vCPU count on a VM, in respect to memory overhead, is also something eays to see in action.

View the summary of a VM from the vSphere Client. The 5th item in the summary is "Memory Overhead: XXX.XXMB"

Edit a powered off VM and change the number of vCPUs, then go back and check Memory Overhead. It will have changed.

Both the amount of memory and vCPUs allocated to a VM will change the overhead values.